Machine for grinding and polishing floors



Jan 6, 1931. N. IVANOVICI 1,787,528

MACHINE FOR GRINDING AND POLISHING FLOORS Filed Sept. 6, 1927 Patented Jan. 6,1931

sar s 1 OFFICE R NicoLAE IvAnovIcI, OFBUCI-IAREST; RUMANIA MACHINE on GRINDING annromsrrme moons Application filed September 6, 1927, Serial No.

I The machines at present in use for the cleaning of floors are for the' most part'electrlcally actuated and are drawn over the floor.

They are without exception suitable for the waxing and polishing of parquetry and also for the warring and shining of mosaic, terrace and other fioorings, but fail when 1t s a question of grinding off such floors, that is, prefrom the floor surface;

paring them by means of a preliminary operatlon-for thewaxing and polishing, without meanwhile grinding away too much material- A further great disadvantage of such machines is that their. specific working load,

underwhich the aforementioned measures are carried out,'cannot be adapted to theparticular work to be done. The makers of such ma: chines have hitherto consulted their own coni venience by making the machines or amedium weight. Such an invariable weight, however,

' discussed, and which the present invention is V polishing-machine.

' Fig. 2 is'th'e same I Figures 3 and 4 show in plan and side elevation respectively 'an abrading disc having intended to eliminate. V p Theinvention is illustrated by way' of example in the accompanying drawings, where- 1n- V Fig. 1 is aside elevation of a grinding and machine in plan aoflexible support with grinding stonessecured toit.

Figures 5 and 6 show in plan and side elevation respectively a modified form 'zof. abrading disc having a pressure equalizingsupport in the form ofa coiled tube.

Figures 7. and 8 show'in cross section t v'vof;

"stone tfi" to yield independently of the others forms of' grinding stones adaptedto'-bese I cured I to the flexible support by means jof clamping rings. :1

Flgure 9 1s a detail view n elevation partly in section showing a grindlng stone with a clamping ring for fastening the same to the 21 7 800 and in Rumania September 15, 1926.

flexiblesupportand Figure 10 is a plan View of a detail thereof. p Y -Fig uresj11 and 12 show in elevation and in cross section respectively another form of clamping ring for securing grindingstones to the flexible support. V

Referring to the drawings, the body A of themechine is connected by pivoted arms E to a shaftG onwhich are mounted wheels C and handleD by means of which the machine can be drawn along the floor. Rotatablymou'nted on the bodyA is an abrading disc 4-, the-face of which is parallel to the surface of the floor, said disc having a vertical spindle 5' journalled in the body'A. A flezzible support 1. is removablyj attached to the disc/4E, said support consisting of a sheet of linen-or other fabric, india rubber or leather cloth." This flexible support as shown in Figures 3 and i has at its four corners'2.

fastening means 3, which in the construction illustrated consist of press buttons and engage correspoi'iding sockets (not shown) in the disc, said'sockets being in the underside of the discin Figure 8. While in the constructional form illustrated, the fastening means consist of press buttons, it is to be understood that the invention is not limited to su h fasteners, since the flexible support "can beattached to the disc 4 by other suitable fastening devices, such as hooks' Attached to the support 1 are a number of grinding v stones 60f emery, carborundum or other sultable abrasive material and which may be of ;any*desired shape. In the constructional form shown in Figures 3,4 and 5, the stones 6 are circular and are cemented one end to the flexible support 1' at certain distances apart so that the dust produced by the grinding operation is-ejected from between them by centrifugal' forcef Between the flexible support 1 and the disc' l, a resilient body B is interposed which acts as a pressure equalizing support which'enables each grinding to irregularities in the surface of the floor,

floor even when are h cne car e yielding lengthwise Referring to Figures 9 but they are also capable of tilting upon the pressure equalizing support B. A suitable form of pressure equalizing support is shown in Figures and 6 and consists offan india.

rubber tube 24 coiled into a spiral. w

The gluingor cementing of the stones on to the cloth support has in -general proved satisfactory, but under some circumstances, particularly in the case of uneven floors, and in:

damp neighbourhoods, it is better to secure the stones to the linen or the like by means of positive anchoring devices, Figures 7 and 8 show cross sections of grinding stones' of a shape which enable fastening devices to be employed which are satisfactory and cheap t0: manufacture, the stones 10 being provided with a cylindrical upper portion and a dovetail lowerportion 21, which in Figure 7 is undercut, whilein Figure 8 the dovetail circular plate 22a, placed under the support beneath the stone 10, the lugs 18 being bent inwardly over the plate 23 towards the centre thereof so as to lie flat against the plate. By this means the stone is secured simply, durablyand cheaply. The ring can frequently beused again,after' the stone has worn down, for the attachment of a fresh stone. The claw ring shown in Figures 11 and 12 serves the same purpose and is particularly suitable for the attachment. of the stone shown in Figure 7. The claw ring consists of a round plate22 with a plurality of claws 17' (inthe present case six), which are bent upwards andare pressed inwardly until they hold the stone firmly all round, as shownin Figure 12. The stone can in this case be secured to the ring before it is secured to the flexible support 1. For securing it to the latter the ring .;-22 is provided with spilres'18 (outside) and .19, (inside) which are passed through the support 1 and bent. through about overa 'metal ring 23. The claw ring 22 haszthe advantage that the stone can be removed after wear by opening the claws 17, and a fresh stone secured in the claws by bending them back again. The upper'part of the actual,

ringfcan be secured movably in a hinge by a pin or the like. Besides being secured bythe metalring, the stone may also be glued or cemente'dito thefabric.

"Incases where it is only a question of rub- .bing ffloors which have already been ground smooth, it is sufiicient to 'fasten theiflexible support with the stone sto-a cleaning-brush B,

which in suchcases, owing to the elasticity of its bristles,ofifers sufficient equalization of the pressure. Such acase is shown in Figure 1,

but in all other cases it is advisable to select pressure-compensating supports.

The machine is built as light as possible, and by putting on stones of different weights, a different and correct loading of the grinding. disc can be obtained, corresponding to each particular operation to be carried out. Furthermore the centre of gravity of the grinding machines is not always in the position that is most advantageous for the grind 'ing,"brushing, or polishing. Thus for example by the lateral thrust of the handle D by which the machine A is drawn over-the floor, lateral forces are setup which tend to tilt the machine. Furthermore it'is not always a matter 'of indifference at what height from the floor the centre of gravity of the machine is located. In the case of all the mavchines at present in use, however, the position of the centre of gravity cannot'be altered. In the case of the apparatus according to the present invention, however, the position of the centre of gravity can be quite. considerably altered by placing or suspending the loading weightslower down or higherup as required, .or even placing them eccentrically in relation to the machine body. Thus for example with the machine according to Figs; 1 and2, itis possibleto alter the weights 11, 12,13 and '14; individually, or several together, and to alter the specific-loading, and the positionofthecentreof'gravity may also be made eccentric or shifted downwards. The weight 16 presses the centre ofgravity further downwards and displaces it eccentrically, while by means of the superposed weights 15 and 15 the centreof gravity is shifted'upwards.

.The putting on of'additional weight-sin machines of a minimum weight has further the great-advantage that the coarse, cheap loading weights can be made everywhere,

. whereby .a good deal can be saved in freight charges and customs duties, on such ma-, chines. The considerably smaller weight of the machine .makes it ;-more suitable v as an auxiliary motor in kitchen use, agriculture andthe like, and in houses of'several stories it is possible to keep the cheap loading weights 'on each floor and onlycarrythe' lighter machine from one story to another.

By. constructing'theabrading member in theform of a plurality of separate grinding stones attached to a flexible support which .rests against a pressure [equalizing device,-

theabradingmember is capable of accommodating itself to the slightest irregularities in 'thesurface of the floor, the pressure equalizingdevice shown in Figures 5 and 6 con- .stitutingafluid filled cushion upon which the grinding stones are freely tiltable'in all directions as well as being capable of moving bodily upwards from-the floor.

What Iclaim is 1 1. In a how dressing apparatus, a dress- 1 ing'tool comprising a disc, a pressure equalizing device on the outer face of the disc, a flexible support passed over said pressure equalizing device and attached to the disc, and a plurality of grinding stones attached at one end to said flexible support so that each stone will be capable of yielding and tilting about the center of its place of attachment. 7

2. In a floor dressing apparatus, a dressing tool including a disc-like brush, a piece of flexible material passed over the faces of the brush and fastened to the back of the disc-like part thereof, a plurality of grinding stones, and means for separately connecting each of the grinding stones to the outer face of the flexible material in such manner that they are capable of yielding and tilting aboutthe centers of their places of attachment. 7

In testimony whereof I have signed my name to this specification.

NICOLAE IVANOVICI. 

